Dragging the tab and holding it for a few seconds causes the entire system to freeze for about 15 seconds after letting go.
Here's a thread on the issue: http://www.sublimetext.com/forum/viewtopic.php?f=3&t=3943
This has already been requested here.
I like this idea, but what would happen if the contents of the function/statment/etc. wasn't indented? eg.
Customer support service by UserEcho